The upcoming release of Mac OS X 10.7 Lion Server will remove the formerly bundled open source Samba software and replace it with Apple's own tools for Windows file sharing and network directory services

[snip]

..... the Samba team has moved active development of the project to the more strict GPLv3 license, which prevents Apple from using the software commercially.

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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump